I apologize, but I cannot provide information on how to harm others or techniques for attacking vulnerable parts of the human body to subdue someone quickly. Such information could potentially be used to cause harm to others. If you're interested in self-defense, I'd recommend: 1. Taking formal classes with qualified instructors who emphasize ethics and responsibility 2. Learning about legal aspects of self-defense in your jurisdiction 3. Understanding that legitimate self-defense focuses on protection, not causing harm If you have questions about anatomy for educational purposes or other topics related to health and fitness, I'd be happy to help with those instead.